Steam-generator.



No. 70|,403. Patented June 3,1902.

' w. SHARKIE & u. CRAWFORD.

STEAM GENERATOR.

(Application filed Jam lfi, 19o2.j (No Model.) 5 Sheets- Sheet I.

l a J J I j m Witnesses. Inventors Patented June 3, I902.

W. SHARKIE &. D. CRAWFORD.

STEAM GENERATOR.

(Application filed Jan. 16, 1902.

5 Sheets-Sheet 2.

(No Model.)

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Inventors,

mg NORRIS warms comuomuwa, wAsHmufcM, 1pc

(No Mudel.)

Patented June 3, 1902. W. SHABKIE & D. CRAWFORD. STEAM GENERATOR.

(Application filed Jan. 15, 1902.}

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7& Q J j Witnesses. Inventors,

No. 70l,403. Patented June 3, I902.

W. SHARKIE &. D. CRAWFORD.

STEAM GENERATOR.

Application filed Jan. 15, 1902.) (No Model.) 5 Sheets-Sheet 4.

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Patented lune 3, I902.

w. sHAmuE & n. CRAWFORD. STEAM GENERATOR.

(Application filed jan. 15, 1902.)

5 Sheets-Sheet 5.

(No Model.)

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UNITED STATES PATENT FFICE.

lVILLIAM SHARKIE ANDDAVID CRAWVFORD, OF GLASGOW, SCOTLAND.

STEAM -G EN ERATO R.

SPECIFICATION forming m of Letters Patent No. 701,403, dated June 3, 1902. Application filed January 15T1902. Serial No. 89,843. (No model.)

To all whom, itmay concern:

Be it known that we, WILLIAM SHARKIE, boiler-maker, of 9 Ure street, Govan, Glasgow, and DAVID CRAWFORD, clerk, of 86Ardgowan street,Glasgow, Scotland, subjects of the King of Great Britain, have invented certain new and useful Improvements in Steam-Generators, of which the following is a specification.

The object of this invention is to improve the construction and arrangement of the parts of steam-generators of that class in which both water-tubes and fire-tubes are used.

Steam-generators provided with both water-tubes and fire-tubes have many advantages over boilers provided either with watertubes only or fire-tubes only; but in spite of this fact up to the presenttime no really efficient and satisfactory boiler with combined water and fire tubes has been placed on the market.

l/Ve believe that our improved water and fire tube boiler will meet all the market requirements and prove eminently satisfactory when in use.

In order that our invention may be properly understood, we have hereunto appended two explanatory sheets of drawings, which show, by way of example, a land and a marine boiler constructed in accordance with our invention.

In the drawings, Figure 1 is a longitudinal section, Fig. 2 a front end e'levation,and Fig. 3 a back end elevation, of the land boiler. Parts have been left out of Figs. 2 and 3 in order that the construction of the boiler may be more clearly shown. Fig. i is a longitudinal section, Fig. 5 a front end elevation, and Fig. 6 a back end elevation, of the marine boiler. Fig. 7 is a back view, and Fig. '8 a section, of a hand-hole cover. Fig. 9 shows a stepped header in vertical section. Fig. 10 shows a method of securing the tubes of the marine boiler. Fig. 11 shows in' section a method of jointing the boiler-plates.

WVe have not shown all thefittings of the boilers, as these may be the same as usual and constitute no part of the invention.

Referring to the drawings, whereon the same reference-letters wherever repeated indicate the same or similar parts, ctis the fur- 1121.60; 12, the nest of inclined water-tubes, which may be arranged in the same manner as in the well-known Baboock and WVilcox water-tube boiler; c, the fire-tube boiler; d, the fire-tubes of the boiler; e, the front, and f the back, water-circulating tubes; g, the mud-drum; 72, the smoke-box; t', the smokestack or chimney; jj, the fire-bridges; 7c, the steam-drum; Z, Fig. 4, the steam-dome, and m the water-line.

The water-tubes Z) are fitted at each end in sectional headers n, composed of rectangular sections, each section being made in the form of a rectangular box, intow'hich the water tubes are fitted. The sections, as shown, are arranged one beside the other and. are connected to the superposed fire-tube boiler c by means of the water-circulating tubes e f. The boiler 0 may be supported horizontally or at a slight incline, as shown at Fig. l, and its front plate 0 and back plate 19 are by hydraulic pressure dished or bent outward, as shown at q, in order that thetubes e f may be fitted therein.

It isa matter of considerable importance that the circulating-tubes should enter the boiler at right angles to its surface, and in order that this may be done without bending the tubes the end plates aredished, as shown. As will be seen, each dished part forms an outward bulge having a fiat under surface into which the circulating-tubes are fitted.

The steam-drum may be arranged across the top of the fire-tube boiler c and be connected to its shell by means of a dished cup or nozzle 0'- on thedrum, which fits onto a similar, but inverted, cup or nozzle 8, secured to the boiler-shell. The two cups may be connected together by four or other suitable number of nipple-tubes t, expanded in place.

In cases where it is desired to have vertical headers then each rectangular section may, as shown at Fig. 9, be pressed in at both sides (or at one side only) by means of hydraulic pressure, so as to form a series of steps 17/, through which holes are madefor the reception of the water-tubes. To step the sections in this manner, we heat each rectangular box-section (which should preferably have rounded corners) in a furnace and while hot place it in the mold of a hydraulic press. The mold is made with suitable steps at its bottom and is provided with fiat sides. The

die of the press is also made with suitable steps. The inside of the section is packed tight with sand, and when the die is forced down on top of the section it squeezes it into the stepped formation, such as shown in section at Fig. 9. When only one side of the boxsection is to be stepped, then of course steps would not be made in the mold-bottom. If desired, instead of packing the box-section with sand a collapsible mandrel of stepped shape can be inserted in the interior of the section.

In the boiler we prefer to use hand-hole and manhole covers made in the manner shown at Figs. 7 and 8. The cover is made in the form of a disk it, which is provided with lugs it, which fit against the inside of the header or boiler-shell n This cover is connected to the bridge 11, by the stud L04. 11. is a soft (preferably metallic) packing-ring, and it is a smaller outside disk fitted on the stud n and held in position by a jam-nut M. A cover made in this manner can be fitted thoroughly tight. Thedisks wandu havebevelededges, as shown, so as to pinch and press the packing outward and force it into any irregularities in the hole of the shell u In the marine boiler shown at Figs. 4, 5, and 6 the fire-tube boiler c is arranged just above and preferably at the same angle of inclination as the nest of Water-tubes h. In this case the rectangular header-sections may be of different lengths and all of them, with the exception of the central ones, angled at their upper ends, so that when they are arranged together they form, as shown, headers with concave upper ends. The circulating-tubes efare fitted in place at right angles to the concave surfaces and radiate inward to the dished parts q of the fire-tube boiler. As will be seen, each dished part is made with a convexed under surface, and the curve of the surface is concentric with the curve of the upper end of the corresponding header.

If so desired, the boiler 0 may be arranged horizontally above the water-tubes b, and in this case stepped headers, such as shown at Fig. 9, would be used.

It will be seen that the tubes b are fitted zigzagwise into the rectangular header-sections.

The circulating-tubes e f may be fitted into the curved boiler-shell in the manner shown at Fig. 10. In this case a strengthening-plate '0 is secured at the inside of the boiler c.

. The plates of the boiler 0 maybe joined together at the longitudinal seams by a joint, such as shown in section at Fig. 11. The meeting plates w w are, as shown, cut with grooves 00 so near to and parallel with their edges, and the thick edges 00 are made so as to lock with an easy fit into the grooves, thereby forming a secure locking-joint, which is also riveted up with butt-straps y, as usual. There may be less rivets employed with this form of joint than with the usual butt-joint.

Of course the boiler may be fitted up differently, according to the purpose it is to be used for and the space it has to occupy.

Having now fully described our invention, what we claim, and desire to secure by Letters Patent, is-

1. In steam-generators, the combination of an inclined nest of water-tubes having sec tional headers connected to each end thereof, a fire-tube boiler having a front and back plate connected thereto, circulating tubes connected to said headers and extending into said front and back plates of the fire-tube boiler, a pair of dished nozzles having their. dished portions in contact with one another with tubes extending through said dished portions, and a drum carried by the upper nozzle, substantially as described.

2. In steam-generators, the combination of an inclined nest of watertubes, sectional headers for the tubes, circulating-tubes connected with the headers, a superposed firetube boiler, end plates on the boiler, outwardly-bulged parts made in the end plates for the reception of the said circulating-tubes, nozzles r, s, secured to the boiler and a drum secured to the nozzles, substantially as set forth.

Signed at Glasgow, Scotland, this 31st day of December, 1901.

WILLIAM SIIARKIE. DAVID CRAWVFORD.

\Vitnesses:

H. D. FITZPATRICK, JOHN PRINGLE. 

